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Filtering by: Contributor advisor sim Cromack, Kermit Jr. Remove constraint Contributor advisor sim: Cromack, Kermit Jr. Decade 1980-1989 Remove constraint Decade: 1980-1989

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Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae

Creator:

Savage, Thomas J.

Abstract:

The objective of this study was to determine how the balance of carbon to nitrogen in a grand fir ecosystem affects the chemistry of emerging grand fir foliage and the growth of western spruce budworm larvae. Forest plots in the grand fir zone of eastern Oregon were thinned, thinned and...

Resource Type:

Masters Thesis
Association of nitrogen-fixing bacteria with ectomycorrhizae in Douglas-fir

Creator:

Niu, Chih-Hao

Abstract:

Many higher plants have mycorrhizae associated with their roots. These structures are often essential for survival and growth (Harley & Smith 1983). Mycorrhizae are known for the abilities to enhance nutrient absorption. While nitrogen-fixing organisms are found as components of the mycorrhizosphere, mycorrhizal fungi are not presently known to fix...

Resource Type:

Masters Thesis
Effect of nitrogen fertilizer and irrigation on Acacia senegal seedling biomass and photosynthesis

Creator:

Warrag, Esam Eldin I.

Abstract:

Seedlings of Acacia senegal were grown in a glass greenhouse to study the effect of nitrogen and irrigation regimes on dry matter production and allocation to different plant organs, net photosynthesis per unit leaf area, and nitrogen content in the different plant organs. Ammonium nitrate (NH4NO3) was used in this...

Resource Type:

Masters Thesis
Soil changes after afforestation in Yellow River loess : a case study in Gansu Province, People's Republic of China

Creator:

McCain, Cindy

Abstract:

Widespread erosion of the Yellow River loess plateau has led to serious soil and water conservation problems for north central China. In the DingXi District of Gansu Province, with less than 400 mm annual precipitation, terraced plantations for timber, fuel, or fodder form part of a large scale afforestation project...

Resource Type:

Masters Thesis
Effects of nutrient and light limitation on mountain hemlock : susceptibility to laminated root rot

Creator:

Matson, P. A. (Pamela A.)

Abstract:

Mountain hemlock forests in the Oregon Cascades exhibit wave-form dieback resulting from infection by laminated root rot (Phellinus weirii). Although Phellinus remains viable in dead roots after the wave of dieback passes, many regenerating mountain hemlock forests do not become immediately reinfected. We measured at least a doubling of nitrogen...

Resource Type:

Dissertation
Denitrification potential in forest riparian soils of the western Oregon Cascades : spatial and temporal variation

Creator:

McClellan, Michael H.

Abstract:

Denitrification, the biological or chemical reduction of ionic nitrogen oxide or dinitrogen, has not been widely studied in forest ecosystems despite widespread interest in other facets of the forest nitrogen economy. This study had three main objectives: to determine whether potential for denitrification exists in forest riparian and hill slope...

Resource Type:

Masters Thesis
Levels of asymbiotic nitrogen fixation in leaf litter in Northwest forests

Creator:

Heath, Brian E.

Abstract:

Asymbiotic N fixation in leaf litter in the Northwest was assayed by acetylene reduction. Annual N input measured by periodic sampling in a young Willamette Valley Douglas-fir plantation at Adair, Oregon was 1.08 +_.13 kg/ha. Using different calculating methods, six other annual estimates at the Adair site ranged from 0...

Resource Type:

Masters Thesis
Case studies of red alder and Sitka alder in Douglas-fir plantations : nitrogen fixation and ecosystem production

Creator:

Binkley, Dan

Abstract:

Seven case studies of 11 ecosystems were used to examine the effects of nitrogen-fixing alders in Douglas-fir plantations. The first case study quantified nitrogen (N) fixation and aboveground net primary production in a young Sitka alder [Alnus sinuata (Regel) Rydb.] ecosystem. At 5 yr of age, the N fixation (C₂2H₂...

Resource Type:

Dissertation
Patterns of soil organic matter and microclimate accompanying the death and regeneration of a mountain hemlock (Tsuga mertensiana ) forest

Creator:

Boone, Richard D.

Abstract:

Soil organic matter levels, soil temperature and moisture, and vegetation properties were measured along a sequence of death and regeneration in a mountain hemlock (Tsuga mertensiana) forest. The sequence is produced by slowly moving waves of the root pathogen Phellinus weirii. While analysis of variance for all sampled soil layers...

Resource Type:

Masters Thesis
The effect of light and nitrogen limitation on western conifers : response to Armillaria ostoyae infection

Creator:

Entry, James A.

Abstract:

Armillaria (Fr. ex. Fr.) is a parasite whose pathogenicity and role in forest ecosystems often depends upon the physiological condition of the tree. Therefore, I tested the frequency and severity of Armillaria ostoyae (Romagn.) Herink infection among Abies grandis (Dougl.) Lindl., Larix occidentalis Nutt., Pinus contorta var. latifolia (Engelm.), Pinus...

Resource Type:

Dissertation

Limit your search

Academic Affiliation

Forest Science10

Advisor

Cromack, Kermit jr.10
Perry, David1

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1982 to 1990

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Committee Member

Bottomley, Peter1
Boyle, James1
Li, C. Y.1
Zaerr, Joe1

Creator

Binkley, Dan1
Boone, Richard D.1
Entry, James A.1
Heath, Brian E.1
Matson, P. A. (Pamela A.)1
more Creators »

Date

Date range begin – Date range end

Current results range from 1982 to 1989

View distribution

Decade

1980-1989[remove]10

Degree Field

Forest Science10

Degree Level

Master's7
Doctoral3

Degree Name

Master of Science (M.S.)7
Doctor of Philosophy (Ph.D.)3

Language

English [eng]10

Non-Academic Affiliation

Oregon State University. Graduate School10

Peer Reviewed

No7

Resource Type

Masters Thesis7
Dissertation3

Rights Statement

Copyright Not Evaluated7
In Copyright3

Subject

Nitrogen -- Fixation2
Abies grandis -- Diseases and pests -- Control1
Abies grandis -- Thinning1
Acacia senegal1
Armillaria1
more Subjects »

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